Hi Vishal,
try to get an ABAP developer next to you. The recommended BAPIs are pretty easy to access correctly. You can try to check it out on your own via Trx. SE37 where you mainly need to fill the version, the planning book, data view, key figure and date range.
You can also use the "where used" list to see how SAP fills the same BAPI (in case they use it somewhere).
Additional documentation on the BAPIs can be found via Trx BAPI.
regards, Peter